单项选择题

Although we may think we are not affected by them, Dr. Krugman believes that advertisements affect （）.

A．all of us
B．most of us
C．some of us
D．a few individuals

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单项选择题

73（）

A．was
B．is
C．has been
D．should be

单项选择题

The author wrote a note of appreciation to the post office because （）.

A．he knew what such a note would mean to the post office
B．he had discovered giving-away made life more exciting
C．he believed he would get something back by doing so
D．the postman delivered an important letter in time